:root {
    --white:#e9e9e9;
    --gray:#3333;
    --blue:#0367a6;
    --lightblue:#008997;

    --button-radius:0.7rem;
    --max-width:758px;
    --max-height:420px;

    font-size: 16px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}  

body {
    align-items: center;
    background-color:var(--white);
    background: url(注册背景.jpg);
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    display: grid;
    height:100vh;
    place-items: center;
}

.form_title{
    font-weight: 300;
    margin: 0;
    margin-bottom: 1.25rem;
}
.link {
    color: var(--gray);
    font-size: 0.9rem;
    margin: 1.5rem 0;
    text-decoration: none;
}


.container {
    background-color: var(--white);
    border-radius: var(--button-radius);
    box-shadow: 0 0.9rem 1.7rem rgb(0, 0, 0.25);
    height: var(--max-height);
    max-width: var(--max-width);
    overflow: hidden;
    position: relative;
    width: 100%;
}
.container_from {
    height: 100%;
    position: absolute;
    top: 0;
    transition: all 0.6s ease-in-out;
}

.container--signin {
    left: 0;
    width: 50%;
    z-index: 2;

}
.container.right-panel-active .container--signin{
    transform: translateX(100%);
}
.container--signup{
    left: 0;
    opacity: 0;
    width: 50%;
    z-index: 1;
}
.container.container.right-panel-active .container--signup{
animation: show 0.6s;
opacity: 1;
    transform: translateX(100%);
    z-index: 5;

}
.container_overlay{
    height: 100%;
    left: 50%;
    overflow: hidden;
    position: absolute;
    top: 0;
    transition:  transform 0.6s ease-in-out;
    width: 50%;
    z-index: 100;
}
.container.right-panel-active .container_overlay {
    transform:  translateX(-100%);
}
.overlay {
    align-items: center;
    background-color: var(--lightblue);
    background: url(注册背景.jpg);
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    height: 100%;
    left: -100%;
    position: relative;
    transform: translateX(0);
    
    transition: transform 0.6s ease-in-out;
    width: 200%;
}
.container.right-panel-active .overlay {
transform: translateX(50%);
}
.overlay_panel{
    align-items: center;
    display: flex;
    flex-direction: column;
    height: 100%;
    justify-content: center;
    position: absolute;
    text-align: center;
    top: 0;
    transform: translateX(0);
    transition:  transform 0.6s ease-in-out;
    width: 50%;
}
.overlay--left {

    transform: translateX(-20%);
}
.container.right-panel-active .overlay--left {
    transform: translateX(0);
}
.overlay--right {
    right: 0;
    transform: translateX(0);
}
.container.right-panel-active .overlay--right {
    transform: translateX(20%);
}
.btn {
    background-color: var(--blue);
    background-image: linear-gradient(90deg,var(--blue) 0%,var(--lightblue) 74%);
    border-radius: 20px;
    border: 1px solid var(--blue);
    color: var(--white);
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: bold;
    letter-spacing: 0.1rem;
    padding: 0.9rem 4rem;
text-transform: uppercase;
transition: transform 80ms ease-in;
}
.form>.btn {
    margin-top: 1.5rem;
}
.btn:active {
    transform: scale(0.95);
}
.btn:focus{
    outline: none;
}
.form {
     text-align: center;
    background-color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: 0 3rem;
    height: 100%;
   
}
.input {
    background-color: #fff;
    border: none;
    padding:0.9rem 0.9rem;
    margin: 0.5rem 0;
    width: 100%;
}
@keyframes show {
    0%,
    49.99%{
        opacity: 0;
        z-index: 1;
    }
    50%,
    100%{
        opacity: 1;
        z-index: 5;
    }
}